Does Apple charge anything for the transaction?
"The biggest “surprise” over last 2 months is that Apple has squeezed 15-25bps from the 5-6 participating banks at launch (C, BAC, COF, JPM, Amex and perhaps WFC)."
http://blog.starpointllp.com/blog/?p=3855A unit that is equal to 1/100th of 1%
The US does about $12B in card transactions per day. This means that for every 1% of US transactions it captures, Apple could add ~$80M to the annual revenue which is a very small amount against its $140B revenue. Yes there are international markets, but still this is not done for profits by itself.